亚硫酸盐预处理强化高含固污泥的自热式高温好氧消化处理工艺

ATAD Enhanced Process of Sulfite Pretreatment for High Solid Sludge Disposal

城市污泥成分复杂多变,除含有大量有机质外,还可能浓缩重金属、微量有机污染物以及少量病原生物等有毒有害物质。自热式高温好氧消化(ATAD)是一种快速稳定污泥的生物处理技术。为提高消化效率,缩短稳定时间,高固体污泥在ATAD前采用亚硫酸盐预处理。在亚硫酸盐(以S计)投加质量浓度为500 mg/L试验条件下,ATAD反应在第9 d挥发性固体的去除率达到40.9%,实现污泥稳定化,比未经预处理的污泥ATAD稳定化时间缩减了12 d。预处理后胞内有机物释放和水解增强,R4组蛋白质和多糖释放提升14.2倍和8.3倍。预处理组和对照组之间微生物组成的显著差异说明了亚硫酸盐预处理能帮助污泥的加速稳定。研究结果可作为实现高固体污泥的快速稳定提供了一种有效而实用的策略。

The composition of municipal sludge is complex and changeable.Besides containing a large amount of organic matter,it may also concentrate heavy metals,trace organic pollutants and a small amount of pathogenic organisms and other toxic and harmful substances.Self-heating high temperature aerobic digestion(ATAD)is a rapid and stable biological treatment of sludge.In order to improve the digestion efficiency and shorten the stabilization time,the high solid sludge was pretreated with sulfite before ATAD.The results showed that sulfite pretreatment could accelerate the stabilization of high solid phase sludge(the stabilization time of ATAD was reduced by 12 d compared with untreated sludge),and the removal rate of volatile solid was 40.9%after 9 days of ATAD treatment at 500 mg/L sulfite(measured in S).The pretreatment was 12 d earlier than the untreated sludge.Intracellular organic matter release and hydrolysis were enhanced,protein and polysaccharide release were increased by 14.2 times and 8.3 times.The significant difference of microbial composition between the pretreatment group and the control group indicated the accelerated stabilization of the sludge under thermal hydrolysis.This work provides an effective and practical strategy for realizing rapid stabilization of high solid sludge.